rosserial_arduino IDE ARDUINO error

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hi, i'm workin' with the Arduino target, i installed the Arduino IDE , and also installed rosserial_arduino and put the ros_lib on the sketchbook file. i try to run , i mean compile the examples, in these case the blink example and i got these error:

Blink.pde:-1: error: ‘ros’ has not been declared
Blink.pde:-1: error: expected constructor, destructor, or type conversion before ‘nh’
Blink.pde:-1: error: expected ‘,’ or ‘...’ before ‘::’ token
Blink.pde:-1: error: ISO C++ forbids declaration of ‘std_msgs’ with no type
Blink.pde:-1: error: ‘ros’ has not been declared
Blink.pde:-1: error: expected constructor, destructor, or type conversion before ‘<’ token
Blink.cpp: In function ‘void setup()’:
Blink.pde:-1: error: ‘nh’ was not declared in this scope
Blink.pde:-1: error: ‘sub’ was not declared in this scope
Blink.cpp: In function ‘void loop()’:
Blink.pde:-1: error: ‘nh’ was not declared in this scope

thnks for any help i can get